건설재료시공학연구실

Building material & construction lab.

The construction of super tall building which structure is RC and must be certainly considered on column shortenning estimation and construction reflected concrete creep has been increased. Regarding the Fck 60-80 Mpa grade high strength concrete applied in the domestic super tall building project, the mechanical properties and creep deflection according to curing condition (Drying creep/Basic creep) were reviewed in this research. Results of compressive strength and elastic modulus under sealed curing condition were reviewed in this research. Results of compressive strength and elastic modulus under sealed curig condition wre 5% hgher tha unsealed condtion and differenc of resuts accordin to curin conditon wa incraed ove time. Autogenous and dryng hrinkage tendency showed adversely in the case of higstrengh concrete. Additionally ceep modulus under unsealcurin conditon wa evauated 2-3 times highe ta seled cnditon. Modified model of ACI-209 based on test rest was applid to estimate long perin shortening of vetical members (such as Core wall/Mega column) exactly, it is designed to modify and suggest the optimal creep model based on various data accumulated during construction, in the future.